The RIS widely studied in existing works [1]}-[2]} is supposed to be passive or nearly-passive, as shown in Fig REF . Passive RIS can reflect signals to achieve a signal-to-noise ratio (SNR) that grows as \(M^2\) , where \(M\)  is the number of RIS elements, while the SNR grows linearly with \(M\)  when using massive MIMO and half-duplex relays [3]}. Besides, a more aggressive power scaling law can be formulated where the transmit power is reduced as \(1/M^2\)  [4]}, [5]}, [3]}, [7]}.
